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Finding the Fourth Proportional to 1,010.88, 1,515.28 and 394.24

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Solution

The fourth proportional to 1,010.88, 1,515.28 and 394.24 is: 590.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.88 : 1,515.28 = 394.24 : x
  2. Step 2: Convert to fraction form
    1,010.88/1,515.28 = 394.24/x
  3. Step 3: Cross multiply
    1,010.88x = 1,515.28 × 394.24
  4. Step 4: Simplify right side
    1,010.88x = 597,383.99
  5. Step 5: Solve for x
    x = 597,383.99/1,010.88
  6. Step 6: Final answer
    x = 590.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.